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Physics Classes: BY Vinit Saluja Sir

The document provides a summary of a physics class on ray optics taught by Vinit Saluja Sir. It includes 10 multiple choice and short answer questions covering topics like the principle of optical fibers, critical angle, power of a lens, refraction, focal length of lenses, total internal reflection, image formation by mirrors and lenses, and lens formulas. The class was 1 hour long and covered Chapter 12 on Ray Optics with a maximum marks of 20.

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Vinit Saluja
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81 views1 page

Physics Classes: BY Vinit Saluja Sir

The document provides a summary of a physics class on ray optics taught by Vinit Saluja Sir. It includes 10 multiple choice and short answer questions covering topics like the principle of optical fibers, critical angle, power of a lens, refraction, focal length of lenses, total internal reflection, image formation by mirrors and lenses, and lens formulas. The class was 1 hour long and covered Chapter 12 on Ray Optics with a maximum marks of 20.

Uploaded by

Vinit Saluja
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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PHYSICS CLASSES

BY
VINIT SALUJA SIR
(ALUMNUS OF NIT KURUKSHETRA & NIT DELHI) PH NO.(7015250795)

Class: XII Chapter: Ray Optics


M.M:20 Duration: 1 hr .

Q1. On which principle Optical Fibers works? (1)


Q2. A substance has critical angle of 45o, what is its refractive index? (1)
Q3. What is the ‘power’ of plane glass plate? (1)
Q4. A light ray passes from air into a liquid as shown in figure. Find refractive index of (1)
liquid.

Q5. a) (3)
The radius of curvature of the surfaces of a double concave lens are 20 cm and 40 cm
respectively and its focal length is 20 cm. What is the refractive index of the material
of lens

b)
Double-convex lenses are to be manufactured from a glass of refractive index 1.55,
with both faces of the same radius of curvature. What is the radius of curvature
required if the focal length is to be 20cm?
Q6. Explain in brief the phenomenon of Total Internal Reflection (3)
Q7. An object of length 2.5cm is placed at a distance of 1.5f from a concave mirror where (3)
f is the focal length of the mirror. The length of object is perpendicular to principal
axis. Find the size of image. Is the image erect or inverted?
Q8. A point object is placed in air at distance of 40 cm from a concave refracting surface (2)
of refractive index 1.5. If radius of curvature of the spherical surface is 20 cm,
calculate the position of the image.
Q9. Derive lens formula for Concave lens. (2.5)
Q10. Derive lens maker formula for Convex lens. (2.5)

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